JP2022028475A - Hot water supply system - Google Patents

Abstract

To provide a hot water supply system that can stably produce hot water having a high temperature even if an outside air temperature is low.SOLUTION: A hot water supply system comprises: a vapor compression type heat pump circuit 10 in which a compressor 11, a first heat dissipation heat exchanger 12A, a second heat dissipation heat exchanger 12B, an expansion valve 13, and a heat absorption heat exchanger 14 are annularly connected by a refrigerant circulation line L9, and heat is dissipated in the first heat dissipation heat exchanger 12A and/or the second heat dissipation heat exchanger 12B while heat is absorbed from heat source air in the heat absorption heat exchanger 14 by driving the compressor 11; and vapor heating means for heating one or more kinds of water out of circulated water W1 passing through a water circulation line L1, makeup water W2 passing through a makeup water line L2, supplied hot water W4 passing through a supplied hot water line L4, and stored water W3 in a hot water storage tank 60 with vapor S1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hot water supply system.

As is well known, the energy efficiency of a heat pump water heater is indicated by COP (coefficient of performance). Various improvements have been made to the refrigeration cycle to increase this COP. For example, in Patent Documents 1 and 2, a supercooler is provided after the condenser of the heat pump circuit, and the stored water in the hot water storage tank is circulated and heated in the condenser, while the supercooler is used in the hot water storage tank. A hot water supply system configured to circulate and preheat make-up water is described.

Special Fair 2-27582 Gazette Jitsukaihei No. 3-3665 Gazette

In the hot water supply system described in Patent Documents 1 and 2, for example, an air heat source type heat pump circuit can be applied. The air heat source type heat pump circuit can be easily operated by raising the hot water temperature of the condenser and the supercooler in the summer or the middle season when heat can be absorbed from the relatively high temperature outside air. However, since the outside air temperature may drop significantly in winter, it is very difficult to operate with the hot water temperature raised. In order to raise the hot water temperature, it is necessary to increase the number of stages of the compressor and the capacity of the blower fan, which increases the initial cost of the system.

The present invention has been made in view of the above problems, and in a configuration in which a heat exchanger for heating stored water and a heat exchanger for heating make-up water are provided in an air heat source type heat pump circuit, the outside air temperature is low. The purpose is to provide a hot water supply system capable of stably producing high-temperature hot water.

In the present invention, the compressor, the first heat dissipation heat exchanger, the second heat dissipation heat exchanger, the expansion valve and the heat absorption heat exchanger are connected in an annular shape by the refrigerant circulation line, and the heat absorption heat is driven by the drive of the compressor. A steam compression type heat pump circuit that absorbs heat from the heat source air with the exchanger and dissipates heat with the first heat dissipation heat exchanger and / or the second heat dissipation heat exchanger, a hot water storage tank for storing make-up water, and the hot water storage. A water circulation line that circulates the stored water in the tank to the first heat dissipation heat exchanger, a make-up water line that sends make-up water to the hot water storage tank while circulating make-up water to the second heat-dissipating heat exchanger, and the above. A hot water supply line that supplies the stored water in the hot water storage tank to the outside, circulating water that circulates in the water circulation line, make-up water that circulates in the make-up water line, hot water supply that circulates in the hot water supply line, and the hot water storage tank. The present invention relates to a hot water supply system including a steam heating means for heating any one or more of the stored water in the water with steam.

Further, the steam heating means of the hot water supply system is provided in the water circulation line from the first heat dissipation heat exchanger to the hot water storage tank, and is a steam heat exchanger that exchanges heat between the circulating water and steam via a heat transfer body. A first temperature detection that detects the temperature of the steam supply line that feeds steam to the steam heat exchanger, the steam supply valve provided in the steam supply line, and the circulating water flowing out of the steam heat exchanger. It is preferable that the steam supply valve is provided with means and the valve opening degree is adjusted so that the detection temperature of the first temperature detecting means becomes the target heating temperature.

Further, the steam heating means of the hot water supply system is provided in the water circulation line from the first heat dissipation heat exchanger to the hot water storage tank, and a steam mixer that mixes steam with the circulating water and steam in the steam mixer. The steam supply valve is provided with a steam supply line for feeding the steam, a steam supply valve provided in the steam supply line, and a first temperature detecting means for detecting the temperature of the circulating water flowing out of the steam mixer. It is preferable that the valve opening degree is adjusted so that the detection temperature of the first temperature detecting means becomes the target heating temperature.

Further, the steam heating means of the hot water supply system is provided in the make-up water line from the second heat dissipation heat exchanger to the hot water storage tank, and steam heat exchange for heat exchange between the make-up water and steam via a heat transfer body. A first temperature for detecting the temperature of the steam supply line for supplying steam to the steam heat exchanger, the steam supply valve provided in the steam supply line, and the make-up water flowing out of the steam heat exchanger. It is preferable that the steam supply valve is provided with a detection means, and the valve opening degree is adjusted so that the detection temperature of the first temperature detection means becomes a target heating temperature.

Further, the steam heating means of the hot water supply system is provided in the make-up water line from the second heat dissipation heat exchanger to the hot water storage tank, and is provided in the steam mixer for mixing the make-up water and steam, and the steam mixer. The steam supply line is provided with a steam supply line for supplying steam, a steam supply valve provided in the steam supply line, and a first temperature detecting means for detecting the temperature of the make-up water flowing out of the steam mixer. It is preferable that the valve opening degree of the valve is adjusted so that the detection temperature of the first temperature detecting means becomes the target heating temperature.

Further, the steam heating means of the hot water supply system is provided in the hot water supply water line, and supplies steam to the steam heat exchanger that exchanges heat between the hot water supply water and steam via a heat transfer element, and the steam heat exchanger. The steam supply line is provided with a steam supply line, a steam supply valve provided in the steam supply line, and a first temperature detecting means for detecting the temperature of hot water supplied from the steam heat exchanger. It is preferable that the valve opening degree is adjusted so that the detection temperature of the first temperature detecting means becomes the target heating temperature.

Further, the steam heating means of the hot water supply system is provided in the hot water supply water line, and includes a steam mixer that mixes hot water supply water and steam, a steam supply line that supplies steam to the steam mixer, and the steam supply line. The steam supply valve is provided with a first temperature detecting means for detecting the temperature of the hot water supplied from the steam mixer, and the steam supply valve has a target temperature detected by the first temperature detecting means. It is preferable that the valve opening is adjusted so as to reach the heating temperature.

Further, the steam heating means of the hot water supply system includes an auxiliary circulation line for circulating the stored water in the hot water storage tank by a route different from the water circulation line, an auxiliary circulation pump provided in the auxiliary circulation line, and the auxiliary. A steam heat exchanger provided in the circulation line for heat exchange between circulating water and steam via a heat transfer body, a steam supply line for supplying steam to the steam heat exchanger, and a steam supply line provided in the steam supply line. The steam supply valve is provided with a first temperature detecting means for detecting the temperature of the circulating water flowing out of the steam heat exchanger, and the steam supply valve has a target heating temperature at the detection temperature of the first temperature detecting means. It is preferable that the valve opening degree is adjusted so as to be.

Further, the steam heating means of the hot water supply system includes an auxiliary circulation line for circulating the stored water in the hot water storage tank by a route different from the water circulation line, an auxiliary circulation pump provided in the auxiliary circulation line, and the auxiliary. A steam mixer provided in the circulation line to mix circulating water and steam, a steam supply line for supplying steam to the steam mixer, a steam supply valve provided in the steam supply line, and the steam mixer. The steam supply valve is provided with a first temperature detecting means for detecting the temperature of the circulating water flowing out from the steam supply valve, and the valve opening degree is adjusted so that the detected temperature of the first temperature detecting means becomes the target heating temperature. Is preferable.

Further, the steam heating means of the hot water supply system is arranged in the hot water storage tank, and supplies steam to the steam heat exchanger that exchanges heat between the stored water and steam via a heat transfer body, and the steam heat exchanger. The steam supply line includes a steam supply line, a steam supply valve provided in the steam supply line, and a first temperature detecting means for detecting the temperature of the stored water in the hot water storage tank, and the steam supply valve has the first temperature. It is preferable that the valve opening is adjusted so that the detection temperature of the detection means reaches the target heating temperature.

Further, the steam heating means of the hot water supply system is arranged in the hot water storage tank, and has a steam mixer that mixes stored water and steam, a steam supply line that supplies steam to the steam mixer, and the steam supply line. The steam supply valve is provided with a steam supply valve provided in the steam supply valve and a first temperature detecting means for detecting the temperature of the stored water in the hot water storage tank. It is preferable that the valve opening degree is adjusted so as to be.

Further, the hot water supply system includes an air preheater that preheats the heat source air before feeding to the heat absorption heat exchanger, and the air preheater uses the steam drain discharged from the steam heat exchanger to be a heat source. It is preferable to preheat the air.

Further, the hot water supply system includes a second temperature sensor that detects the temperature of the circulating water flowing out from the first heat dissipation heat exchanger, and the control means has the detection temperature of the second temperature sensor as the target hot water discharge temperature. As described above, it is preferable to control the drive frequency of the water circulation pump.

Further, the hot water supply system includes a third temperature sensor that detects the temperature of the heat source air before feeding to the heat absorption heat exchanger, and the control means means that the higher the detection temperature of the third temperature sensor, the higher the target hot water discharge. While the temperature is set high, it is preferable to set the target hot water temperature lower as the detection temperature of the third temperature sensor is lower.

According to the present invention, in a configuration in which a heat exchanger for heating stored water and a heat exchanger for heating make-up water are provided in an air heat source type heat pump circuit, high-temperature hot water can be stably maintained even when the outside air temperature is low. It is possible to provide a hot water supply system that can be manufactured.

It is a figure which shows typically the structure of the hot water supply system which concerns on 1st Embodiment of this invention. It is a figure which shows typically the structure of the hot water supply system which concerns on the modification of the said embodiment. It is a figure which shows typically the structure of the hot water supply system which concerns on 2nd Embodiment of this invention. It is a figure which shows typically the structure of the hot water supply system which concerns on the modification of the said embodiment. It is a figure which shows typically the structure of the hot water supply system which concerns on 3rd Embodiment of this invention. It is a figure which shows typically the structure of the hot water supply system which concerns on the modification of the said embodiment. It is a figure which shows typically the structure of the hot water supply system which concerns on 4th Embodiment of this invention. It is a figure which shows typically the structure of the hot water supply system which concerns on the modification of the said embodiment. It is a figure which shows typically the structure of the hot water supply system which concerns on 5th Embodiment of this invention. It is a figure which shows typically the structure of the hot water supply system which concerns on the modification of the said embodiment.

<First Embodiment>
Hereinafter, the first embodiment of the hot water supply system 1 of the present invention will be described with reference to the drawings. The term "line" as used herein is a general term for lines capable of flowing fluids such as flow paths, routes, and pipelines.

FIG. 1 is a diagram schematically showing a configuration of a hot water supply system 1 according to the present embodiment. As shown in FIG. 1, the hot water supply system 1 of the present embodiment includes an air heat source type heat pump circuit 10, a hot water storage tank 60, a water circulation line L1 that circulates the stored water W3 in the hot water storage tank 60 as circulating water W1. A make-up water line L2 for supplying the make-up water W2 to the hot water storage tank 60, a hot water supply water line L4 for supplying the stored water W3 in the hot water storage tank 60 to the outside, and a control unit 100 are provided.
The hot water supply system 1 is a system that supplies the stored water W3 in the hot water storage tank 60 heated by the heat pump circuit 10 as hot water supply water W4 to a hot water demand point or a hot water demand place.

The air heat source type heat pump circuit 10 includes a compressor 11, a first heat exchanger 12A (condenser 12A), a second heat exchanger 12B (supercooler 12B), an expansion valve 13, and heat exchange for heat absorption. The device 14 (evaporator 14) is annularly connected by the refrigerant circulation line L9, and the heat absorption heat exchanger 14 absorbs heat from the heat source air by driving the compressor 11, while the first heat dissipation heat exchanger 12A and / or the second heat exchanger 14A and / or the second. This is a steam compression type heat pump circuit that takes out heat with the heat exchanger 12B for heat dissipation. Refrigerant R flows through the refrigerant circulation line L9.

The compressor 11 has an electric motor 15 as a drive source, and compresses a gaseous refrigerant R (gas refrigerant R) such as Freon gas into a high-temperature and high-pressure refrigerant R. The first heat exchanger 12A is a condenser that dissipates heat to the circulating water W1 sent through the water circulation line L1 and condenses the refrigerant R from the compressor 11. The second heat exchanger 12B dissipates heat to the make-up water W2 sent through the make-up water line L2, and supercools the refrigerant R (liquid refrigerant R) that has passed through the first heat exchanger 12A. It is a cooler. The expansion valve 13 reduces the pressure and temperature of the refrigerant R by passing the refrigerant R sent from the second heat dissipation heat exchanger 12B. The endothermic heat exchanger 14 is an evaporator that absorbs heat from heat source air as a heat source fluid and evaporates the refrigerant R sent from the expansion valve 13.

The first heat radiating heat exchanger 12A for heating the stored water indirectly exchanges heat between the circulating water W1 and the refrigerant R, and dissipates the latent heat and sensible heat of the refrigerant R. The first heat exchanger 12A condenses and liquefies the refrigerant R using the circulating water W1 and heats the circulating water W1 using the refrigerant R.
The second heat radiating heat exchanger 12B for heating the make-up water indirectly exchanges heat between the make-up water W2 and the refrigerant R to dissipate the sensible heat of the refrigerant R. The second heat exchanger 12B supercools the refrigerant R using the make-up water W2 and heats the make-up water W2 using the refrigerant R.
As described above, by separating the heat exchanger for the condensation and the supercooling of the refrigerant R, the design of the heat exchanger can be facilitated and the cost can be reduced. In addition, a general-purpose heat exchanger can be used.
If the condensed liquefaction of the gas refrigerant R in the first heat exchanger 12A stops at a partial phase change due to operating conditions or the like, the remaining gas refrigerant R in the second heat exchanger 12B Condensation is performed.

The expansion valve 13 is configured as a proportionally controlled needle valve, and the stroke of the needle valve is changed by controlling the rotation speed of the drive stepping motor to adjust the valve opening degree, thereby adjusting the flow rate of the refrigerant R flowing through the refrigerant circulation line L9. Can be adjusted.

The heat absorption heat exchanger 14 is configured as an indirect heat exchanger that exchanges heat between the refrigerant R flowing through the refrigerant circulation line L9 and the heat source air. Here, as the heat source air, outdoor outside air, factory air, or the like can be used.

On the air supply side of the heat absorption heat exchanger 14, a third temperature sensor 18 is provided as a heat source temperature sensor for detecting the temperature of the heat source air before feeding to the heat absorption heat exchanger 14.
The third temperature sensor 18 (heat source temperature sensor 18) is arranged near the heat transfer surface of the heat absorption heat exchanger 14, and directly measures the temperature of the heat source air (supply air) actually supplied to the heat transfer surface. It is preferable, but not limited to, the mode of measurement. For example, the third temperature sensor 18 may indirectly measure the temperature of the air as the heat source fluid by measuring the temperature of the member with which the air as the heat source fluid is in contact.
The heat source temperature sensor 18 may be configured by a thermistor or the like, held in a case, for example, and then attached to the endothermic heat exchanger 14.

On the exhaust side of the endothermic heat exchanger 14, a propeller fan 19 for circulating heat source air is arranged on the heat transfer surface. The endothermic heat exchanger 14 and the propeller fan 19 are housed in a casing having an air blowing surface after heat exchange. The air blowing surface may be provided on the upper surface of the casing or may be provided on the front surface of the casing. The type in which the blowout surface is provided on the upper surface of the casing is called the top blow type, and the type in which the blowout surface is provided on the front surface of the casing is called the side blow type.

In the present embodiment, the air preheater 55 is provided on the air supply side of the endothermic heat exchanger 14. The air preheater 55 preheats the heat source air before feeding to the endothermic heat exchanger 14 by using the steam drain S2 discharged from the steam heat exchanger 40A described later. The air preheater 55 is composed of, for example, a fin tube type heat exchanger.
As shown in FIG. 1, the heat source air A1 may be blown to the air preheater 55 by using the blower fan 551, and the preheated heat source air A2 may be sent to the endothermic heat exchanger 14.
With such a configuration, the heat source air A1 becomes the heat source air A2 appropriately heated by the air preheater 55, and the heated heat source air A2 becomes the refrigerant R on the heat transfer surface of the heat absorption heat exchanger 14. After heat exchange with, the heat is exhausted as the heat source air A3 after the heat exchange. The above-mentioned third temperature sensor 18 measures the temperature of the heat source air A2 after preheating heated by the air preheater 55.

As a result, the amount of heat input to the heat absorption heat exchanger 14, and the amount of heat output from the first heat dissipation heat exchanger 12A and the second heat dissipation heat exchanger 12B increase. Therefore, the COP of the heat pump circuit can be improved even in the winter when the outside air temperature is low. Further, by blowing the heat source air A2 appropriately heated by the air preheater 55 to the endothermic heat exchanger 14, freezing on the heat transfer surface can be prevented.

As described above, in the heat absorption heat exchanger 14, the refrigerant R takes heat from the outside and vaporizes, while in the first heat dissipation heat exchanger 12A and the second heat dissipation heat exchanger 12B, the heat pump circuit 10 takes heat from the outside and vaporizes it. The refrigerant R dissipates heat to the outside, condenses and liquefies, and is overcooled. Using such a principle, the heat pump circuit 10 draws heat from the heat source air by the endothermic heat exchanger 14, heats the circulating water W1 by the first heat exchanger 12A, and heats the second heat dissipation. The make-up water W2 is heated by the exchanger 12B.

The hot water storage tank 60 is a tank that stores the circulating water W1 and the make-up water W2 heated by the heat pump circuit 10 as the stored water W3. The stored water W3 in the hot water storage tank 60 is supplied as hot water supply water W4 to a hot water demand point or a hot water demand point through a hot water supply water line L4.

The hot water storage tank 60 includes a hot water storage temperature sensor 61 that detects the temperature of the stored water W3 in the hot water storage tank 60. The hot water storage temperature sensor 61 monitors the temperature of the stored water W3 that will be supplied to the hot water demand point or the hot water demand point as the hot water supply water W4.

The hot water storage tank 60 includes a water level sensor 62 that detects the water level in the hot water storage tank 60. In the present embodiment, the water level sensor 62 is composed of an electrode type water level detector including a plurality of electrode rods. Specifically, a plurality of electrode rods having different lengths are inserted and held at different height positions of the lower end portions thereof. Each electrode rod detects the presence or absence of a water level at the lower end portion depending on whether or not the lower end portion thereof is immersed in water. As a result, the water level sensor 62 detects the water level of the stored water W3 in the hot water storage tank 60.

The upstream side of the water circulation line L1 is connected to the hot water storage tank 60, and the downstream side is also connected to the hot water storage tank 60. The water circulation line L1 forms a circulation path for circulating the stored water W3 in the hot water storage tank 60 as the circulating water W1. The stored water W3 in the hot water storage tank 60 passes through the first heat dissipation heat exchanger 12A through the water circulation line L1 to be heated, and returns to the hot water storage tank 60. In the water circulation line L1, a water circulation pump 21, a first heat exchanger 12A for heat dissipation, and a second temperature sensor 22 as a condenser hot water temperature sensor are sequentially arranged from the upstream side.

The rotation speed of the water circulation pump 21 can be controlled by an inverter. By changing the rotation speed of the water circulation pump 21, the flow rate of the circulating water W1 circulating in the water circulation line L1 can be adjusted.

The second temperature sensor 22 (condenser hot water temperature sensor 22) is arranged on the downstream side of the first heat exchanger 12A for heat dissipation, and detects the temperature of the circulating water W1 flowing out from the first heat exchanger 12A for heat dissipation. do.

The upstream side of the make-up water line L2 is connected to a make-up water source such as a make-up water tank (not shown), and the downstream side thereof is connected to the hot water storage tank 60. The make-up water line L2 is a line for supplying the make-up water W2 to the hot water storage tank 60 while circulating the make-up water W2 to the second heat exchanger 12B. A make-up water valve 25 and a second heat radiating heat exchanger 12B are sequentially arranged in the make-up water line L2 from the upstream side.

The make-up water valve 25 is configured so that the valve opening degree can be adjusted. By adjusting the valve opening degree of the make-up water valve 25, the flow rate of the make-up water W2 flowing through the make-up water line L2 can be adjusted.

The make-up water line L2 includes a make-up water bypass line L12. The make-up water bypass line L12 is a line that bypasses the make-up water W2 to the second heat dissipation heat exchanger 12B. A make-up water distribution valve 32 is arranged on the make-up water bypass line L12.

The make-up water distribution valve 32 adjusts the distribution amount of the make-up water W2 to be supplied to the second heat radiating heat exchanger 12B and the make-up water W2 to be supplied to the make-up water bypass line L12. The valve opening degree of the make-up water distribution valve 32 may be adjusted automatically or manually. For example, when it is detected that the water level of the stored water W3 in the hot water storage tank 60 has dropped sharply, the make-up water distribution valve 32 may be opened automatically or manually. As a result, the make-up water W2 that has not been heated by the second heat radiating heat exchanger 12B is rapidly replenished in the hot water storage tank 60, and the hot water storage tank 60 is prevented from becoming drought.

The upstream side of the hot water supply water line L4 is connected to the hot water storage tank 60. The hot water supply line L4 supplies the stored water W3 in the hot water storage tank 60 to an external hot water demand point or hot water demand point.

The hot water supply system 1 of the present embodiment has a steam heating means 50A for heating the circulating water W1 flowing through the water circulation line L1 with the steam S1. The steam S1 used here is, for example, steam of 0.2 MPa (saturation temperature 134 ° C.) to 2 MPa (saturation temperature 212 ° C.) generated by a steam generator such as a multi-tube small once-through steam boiler.

The steam heating means 50A includes a steam heat exchanger 40A, a first temperature sensor 42A as a first temperature detecting means, a steaming line L21, and a steaming valve 43.

The steam heat exchanger 40A is provided in the water circulation line L1 from the first heat dissipation heat exchanger 12A to the hot water storage tank 60. The steam heat exchanger 40A is an indirect heat exchanger that exchanges heat between the circulating water W1 and the steam S1 via a heat transfer body.
The circulating water W1 heated to a relatively medium temperature (for example, 50 to 70 ° C.) in the first heat exchanger 12A is heated by the steam S1 in the steam heat exchanger 40A and has a relatively high temperature (for example, 75). The temperature is raised to ~ 95 ° C.).
The circulating water W1 heated by the steam heat exchanger 40A is supplied to the hot water storage tank 60 through the water circulation line L1.

The first temperature sensor 42A (first temperature detecting means 42A) is provided in the water circulation line L1. The first temperature sensor 42A detects the temperature of the circulating water W1 flowing out of the steam heat exchanger 40A.

The upstream side of the steaming line L21 is connected to a steam header (a steam collecting / distributing device generated by a steam boiler or the like) (not shown), and the downstream side thereof is connected to a steam heat exchanger 40A. The steaming line L21 feeds the steam S1 from the steam header to the steam heat exchanger 40A. The steam supply line L21 is provided with a steam supply valve 43.

The steam supply valve 43 is configured so that the valve opening degree can be adjusted. By adjusting the valve opening degree of the steaming valve 43, the flow rate of the steam S1 flowing through the steaming line L21 can be adjusted.

The hot water supply system 1 of the present embodiment further includes a steam drain line L22. The upstream side of the steam drain line L22 is connected to the steam heat exchanger 40A, the downstream side thereof is connected to the air preheater 55, and the downstream side thereof continues to the downstream side of the air preheater 55. The steam drain line L22 feeds the steam drain S2 discharged from the steam heat exchanger 40A to the air preheater 55. As described above, the air preheater 55 preheats the heat source air by utilizing the steam drain S2 discharged from the steam heat exchanger 40A. The steam drain S2 used in the air preheater 55 is discharged to the downstream side of the air preheater 55 through the steam drain line L22.

The stored water W3 in the hot water storage tank 60 heated by passing through the water circulation line L1 and the make-up water line L2 is supplied as hot water supply water W4 to the hot water demand point or the hot water demand point through the hot water supply water line L4.

The hot water demand point refers to various production facilities in the factory that consume the stored water W3 by using the hot water supply water W4 as a fluid. Examples of hot water demand locations include container cleaning equipment (rincers) for food, beverages, and chemicals, and heat sterilization equipment (pastorizers) for bottled, canned, and bagged products.
On the other hand, the thermal demand location refers to a production facility or the like that uses only the thermal energy of the hot water supply water W4 and does not consume the stored water W3. The use of heat energy is performed via various heat exchangers, and the hot water supply water W4 whose temperature has dropped due to the extraction of heat energy is returned to the hot water storage tank 60 through a hot water return water line (not shown). Examples of hot demand points include degreasing tanks and chemical conversion tanks in coating equipment for metal processed products, air handling units in air conditioning equipment, and the like.
At such hot water demand points and hot water demand points, it may always be required to supply hot water supply water W4 in a high temperature range of about 75 ° C. to 90 ° C. According to the hot water supply system 1 of the present embodiment, in such an application in which the supply of hot water having a temperature within a predetermined temperature range is always required, the hot water is efficiently heated and the temperature is adjusted to be particularly suitable. It can be supplied while being maintained.

Next, the control unit 100 (control means 100) of the hot water supply system 1 of the present embodiment will be described. The control unit 100 is composed of a microprocessor including a CPU and a memory. The control unit 100 has a water circulation pump control unit 110 as a circulating water flow rate control unit, a target hot water temperature setting unit 115, a make-up water valve control unit 120 as a make-up water flow rate control unit, and a steam heating control unit as functional blocks. The steam supply valve control unit 150 and the like are provided.
Here, the broken line in FIG. 1 shows the main electrical connection path in the present embodiment. Although these electrical connections actually go through the control unit 100, that point is omitted.

The water circulation pump control unit 110 acquires the detected temperature of the second temperature sensor 22, and controls the drive frequency of the water circulation pump 21 constituting the circulating water flow rate adjusting means according to the detected temperature. Specifically, the water circulation pump control unit 110 controls the drive frequency of the water circulation pump 21 so that the detected temperature of the second temperature sensor 22 becomes the target hot water discharge temperature, and adjusts the flow rate of the circulating water W1. As a more specific control, for example, a feedback control is performed by using the hot water temperature detected in real time by the second temperature sensor 22 as a feedback value and adjusting the drive frequency of the water circulation pump so that the hot water temperature converges to the target hot water temperature. It is preferable to adopt. As the feedback control, in addition to the proportional control (P control), an operation amount calculation algorithm that combines the integral control (I control) and / or the differential control (D control) can be adopted.

As a result, the circulating water W1 supplied from the hot water storage tank 60 to the first heat dissipation heat exchanger 12A is heated to the target hot water discharge temperature (for example, 70 ° C.) by the first heat dissipation heat exchanger 12A, and then the hot water storage tank 60. Is refluxed at a constant temperature. As a result, even if the outside air temperature fluctuates seasonally, hot water having a required base temperature (for example, the minimum hot water supply temperature required at a hot water demanding place or a hot water demanding place) can be stored at high speed in the hot water storage tank 60.

The target hot water temperature setting unit 115 sets the above-mentioned target hot water temperature. Specifically, the target hot water temperature setting unit 115 acquires the detected temperature of the third temperature sensor 18 as the heat source temperature sensor, and the circulating water discharged from the first heat dissipation heat exchanger 12A according to the detected temperature. Set the target hot water temperature of W1. More specifically, the target hot water temperature setting unit 115 sets the target hot water temperature higher as the detection temperature of the third temperature sensor 18 is higher, while the target hot water temperature is lower as the detection temperature of the third temperature sensor 18 is lower. Set. In the present embodiment, the third temperature sensor 18 measures the temperature of the heat source air A2 after preheating heated by the air preheater 55.

As a result, for example, when outside air is used as the heat source air, the lower the outside air temperature, the lower the outlet temperature of the first heat dissipation heat exchanger 12A for operation, so that the COP of the heat pump circuit 10 is improved. Further, as the outside air temperature is lower, the circulating flow rate of the first heat exchanger 12A is increased, so that the hot water storage temperature rises in a short time. Further, even when the hot water outlet temperature of the first heat radiating heat exchanger 12A is low, the insufficient amount of heat is supplemented by the steam S1. As a result, high-temperature hot water can be continuously produced while improving the COP of the entire system.

The make-up water valve control unit 120 acquires the water level information of the stored water W3 in the hot water storage tank 60 detected by the water level sensor 62, and the valve of the make-up water valve 25 constituting the make-up water flow rate adjusting means according to the water level information. Control to adjust the opening. Specifically, the make-up water valve control unit 120 reduces the valve opening degree of the make-up water valve 25 to reduce the make-up water flow rate as the detected water level of the water level sensor 62 becomes higher, while the detected water level of the water level sensor 62 becomes lower. Indeed, control is performed to increase the valve opening degree of the make-up water valve 25 to increase the make-up water flow rate. For example, when the water level is full, the valve opening of the make-up water valve 25 is set to 0% (fully closed), and when the water level is just before the drought, the valve opening of the make-up water valve 25 is set to 100% (fully open). ), And when the water level is in the middle, the valve opening of the make-up water valve 25 is set to 5% to 95%.

In this way, the valve opening of the make-up water valve 25 is decreased as the detected water level of the water level sensor 62 is higher, while the valve opening of the make-up water valve 25 is increased as the detected water level of the water level sensor 62 is lower. Therefore, the make-up water flow rate is increased or decreased in response to the increase or decrease in the hot water demand. That is, the make-up water valve 25 is not closed unless the demand for hot water becomes zero, and the make-up water W2 continues to flow in the second heat exchanger 12B for heat dissipation. As a result, even when the demand for hot water is small, the supercooling of the liquid refrigerant R can be continued and the COP can be increased.

The steam supply valve control unit 150 configured as a part of the steam heating means 50A acquires the detection temperature of the first temperature sensor 42A, and controls to adjust the valve opening degree of the steam supply valve 43 according to the detected temperature. I do. Specifically, the steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42A becomes the target heating temperature (for example, 90 ° C.). As a more specific control, for example, the temperature of the circulating water W1 detected in real time by the first temperature sensor 42A is used as a feedback value, and the steam supply valve 43 is set so that the temperature of the circulating water W1 converges to the target heating temperature. It is preferable to adopt feedback control that adjusts the valve opening of the valve. As the feedback control, in addition to the proportional control (P control), an operation amount calculation algorithm that combines the integral control (I control) and / or the differential control (D control) can be adopted.
Here, the target heating temperature is set manually or automatically according to the state of the device or the like.

In this way, the water circulation line L1 is provided with the steam heat exchanger 40A, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam heat exchanger 40A becomes the target heating temperature (for example, 90 ° C.), whereby the hot water storage tank 60 is provided. The hot water of the target heating temperature is accumulated. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

With the above configuration, in the heat pump circuit 10, hot water having a relatively medium temperature (for example, 50 to 70 ° C.) is generated in the first heat exchanger 12A for heat dissipation. The medium temperature hot water is heated by the steam S1 while flowing through the water circulation line L1 to become hot water having a relatively high temperature (for example, 75 to 95 ° C.). As a result, while operating the heat pump circuit 10 under the condition of medium-temperature hot water that can be expected to have a high COP, it is possible to quickly produce high-temperature hot water required at hot water demand points and hot water demand points. Further, since the steam S1 has a high calorific value, even if the temperature of the heat source air fluctuates seasonally and the temperature of the hot water generated by the heat pump circuit 10 is not stable, the steam S1 is immediately heated to the required hot water supply temperature. can do.

Subsequently, a modification of the first embodiment will be described with reference to the drawings. FIG. 2 is a diagram schematically showing a configuration of a hot water supply system according to a modified example of the first embodiment. In this modification, the configuration of the steam heating means is different from that of the above embodiment. This modification includes steam heating means 51A instead of steam heating means 50A. The steam heating means 51A is provided with the steam mixer 41A instead of the steam heat exchanger 40A as compared with the steam heating means 50A.

The steam mixer 41A is provided on the water circulation line L1 from the first heat dissipation heat exchanger 12A to the hot water storage tank 60. The steam mixer 41A mixes the steam S1 supplied from the steaming line L21 with the circulating water W1 flowing through the water circulation line L1. As a result, heat exchange is directly performed between the circulating water W1 and the steam S1, and as a result, the temperature of the circulating water W1 flowing through the water circulation line L1 rises. At this time, the total heat of the steam S1, that is, sensible heat and latent heat, is utilized to rapidly raise the temperature of the circulating water W1 flowing through the water circulation line L1. In this modification, a static mixer is used as the steam mixer. The static mixer is a static mixer without a drive unit, and has a configuration in which steam S1 is mixed with circulating water W1 by a spiral element arranged in a pipe.

The other components constituting the steam heating means 51A, that is, the first temperature sensor 42A, the steaming line L21, and the steaming valve 43 are the same as the components of the steam heating means 50A. Further, the control content of the steam supply valve control unit 150 configured as a part of the steam heating means 51A is the same as the control content described above. That is, the steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42A becomes the target heating temperature (for example, 90 ° C.).

When the steam mixer 41A is used, the steam drain is not discharged, so that the steam drain line L22 and the air preheater 55 are not provided in this modification.
In this modification, the third temperature sensor 18 detects the temperature of the heat source air A1 that has not been preheated by the air preheater 55. The target hot water temperature setting unit 115 sets the target hot water temperature of the circulating water W1 discharged from the first heat dissipation heat exchanger 12A according to the detected temperature.

In this way, the water circulation line L1 is provided with the steam mixer 41A, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam mixer 41A becomes the target heating temperature (for example, 90 ° C.), so that the hot water storage tank 60 is targeted. Hot water at the heating temperature is accumulated. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature. Further, since the steam condensed water generated after the latent heat is used is added to the circulating water W1, the hot water production capacity is also improved.

In the first embodiment and its modifications, a temperature sensor is used as the first temperature detecting means 42A. However, a heat sensitive cylinder may be used instead of the temperature sensor. In this case, the first temperature detecting means 42A and the steam supply valve 43 constitute a self-powered automatic temperature control valve.
When the heat-sensitive cylinder is used as the first temperature detecting means 42A, the valve opening degree of the steam supply valve 43 is adjusted by the valve driving force generated by the heat-sensitive cylinder so that the detected temperature of the heat-sensitive cylinder becomes the target heating temperature. ..
Specifically, when the temperature of the temperature detection unit of the heat-sensitive cylinder changes, the evaporation pressure of the filling liquid enclosed in the heat-sensitive cylinder changes, and a valve driving force is generated. A bellows is provided in the steam supply valve 43 configured as an automatic temperature control valve, and the bellows expands and contracts due to the valve driving force (change in evaporation pressure) described above. Then, the valve body moves up and down due to the expansion and contraction of the bellows, and the valve opening degree is adjusted.
Even with such a configuration, the same effects as those of the first embodiment and its modifications can be obtained. When the heat sensitive cylinder is used as the first temperature detecting means 42A, the control unit 100 does not have to have the steam supply valve control unit 150.

According to the hot water supply system 1 of the first embodiment described above, the effects shown in the following (1) to (6) are obtained.

(1) In the hot water supply system 1 of the present embodiment, the compressor 11, the first heat heat exchanger 12A, the second heat exchanger 12B, the expansion valve 13, and the heat absorption heat exchanger 14 are provided by the refrigerant circulation line L9. A steam compression type that is connected in an annular shape and absorbs heat from the heat source air by the heat absorption heat exchanger 14 by driving the compressor 11 and dissipates heat by the first heat dissipation heat exchanger 12A and / or the second heat dissipation heat exchanger 12B. The heat pump circuit 10, the hot water storage tank 60 for storing the make-up water W2, the water circulation line L1 for circulating the stored water W3 in the hot water storage tank 60 to the first heat exchanger 12A, and the make-up water W2 for the second heat dissipation. The make-up water line L2 that supplies the hot water to the hot water storage tank 60 while circulating to the exchanger 12B, the hot water supply water line L4 that supplies the stored water W3 in the hot water storage tank 60 to the outside, and the hot water heated in the heat pump circuit 10. Is provided with a steam heating means for heating with steam S1.
In the heat pump circuit 10, hot water having a relatively medium temperature (for example, 50 to 70 ° C.) is generated in the first heat dissipation heat exchanger 12A and / or the second heat dissipation heat exchanger 12B. The medium temperature hot water is heated by the steam S1 to become hot water having a relatively high temperature (for example, 75 to 95 ° C.). As a result, while operating the heat pump circuit 10 under the condition of medium-temperature hot water that can be expected to have a high COP, it is possible to quickly produce high-temperature hot water required at hot water demand points and hot water demand points. Further, since the steam S1 has a high calorific value, even if the temperature of the heat source air fluctuates seasonally and the temperature of the hot water generated by the heat pump circuit 10 is not stable, the steam S1 is immediately heated to the required hot water supply temperature. can do.

(2) The steam heating means 50A of the hot water supply system 1 of the present embodiment is provided in the water circulation line L1 from the first heat dissipation heat exchanger 12A to the hot water storage tank 60, and the circulating water W1 and the steam S1 are passed through the heat transfer body. Outflow from the steam heat exchanger 40A for heat exchange, the steam supply line L21 for supplying steam S1 to the steam heat exchanger 40A, the steam supply valve 43 provided in the steam supply line L21, and the steam heat exchanger 40A. A first temperature detecting means 42A (first temperature sensor / heat sensitive cylinder) for detecting the temperature of the circulating water W1 is provided, and the steam supply valve 43 has a detection temperature of the first temperature detecting means 42A as a target heating temperature. (By the control means 100 / by the valve driving force generated by the heat sensitive cylinder), the valve opening degree is adjusted.
In this way, the water circulation line L1 is provided with the steam heat exchanger 40A, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam heat exchanger 40A becomes the target heating temperature (for example, 90 ° C.), whereby the hot water storage tank 60 is provided. The hot water of the target heating temperature is accumulated. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

(3) The steam heating means 51A of the hot water supply system 1 of the present embodiment is provided in the water circulation line L1 from the first heat dissipation heat exchanger 12A to the hot water storage tank 60, and is a steam mixer that mixes the steam S1 with the circulating water W1. 41A, a steam supply line L21 that feeds steam S1 to the steam mixer 41A, a steam supply valve 43 provided in the steam supply line L21, and a third that detects the temperature of the circulating water W1 flowing out of the steam mixer 41A. 1 The temperature detecting means 42A (first temperature sensor / heat sensitive cylinder) is provided, and the steam supply valve 43 is provided so that the detected temperature of the first temperature detecting means 42A becomes the target heating temperature (by the control means 100 / heat sensitive cylinder). The valve opening is adjusted (by the valve driving force generated by).
In this way, the water circulation line L1 is provided with the steam mixer 41A, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam mixer 41A becomes the target heating temperature (for example, 90 ° C.), so that the hot water storage tank 60 is targeted. Hot water at the heating temperature is accumulated. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.
Further, since the steam condensed water generated after the latent heat is used is added to the circulating water W1, the hot water production capacity is also improved.

(4) The hot water supply system 1 of the present embodiment includes an air preheater 55 for preheating the heat source air before feeding to the heat absorption heat exchanger 14, and the air preheater 55 is discharged from the steam heat exchanger 40A. The heat source air is preheated using the steam drain S2.
As described above, by providing the air preheater 55 that preheats the heat source air (outside air) by using the steam drain S2 discharged from the steam heat exchanger 40A, the heat input amount of the heat absorption heat exchanger 14 and the first The amount of heat output from the heat radiating heat exchanger 12A and the second heat radiating heat exchanger 12B increases. As a result, the COP of the heat pump circuit 10 can be improved even in the winter when the outside air temperature is low. Further, by blowing appropriately heated heat source air to the endothermic heat exchanger 14, freezing on the heat transfer surface can be prevented.

(5) The hot water supply system 1 of the present embodiment includes a water circulation pump 21 provided in the water circulation line L1, a second temperature sensor 22 for detecting the temperature of the circulating water W1 flowing out of the first heat dissipation heat exchanger 12A, and a second temperature sensor 22. The control means 100 controls the drive frequency of the water circulation pump 21 so that the detected temperature of the second temperature sensor 22 becomes the target hot water discharge temperature.
As a result, the circulating water W1 supplied from the hot water storage tank 60 to the first heat dissipation heat exchanger 12A is heated to the target hot water discharge temperature (for example, 70 ° C.) by the first heat dissipation heat exchanger 12A, and then the hot water storage tank. It is refluxed to 60 at a constant temperature. As a result, even if the outside air temperature fluctuates seasonally, hot water having a required base temperature (for example, the minimum hot water supply temperature required at a hot water demanding place or a hot water demanding place) can be stored at high speed in the hot water storage tank 60.

(6) The hot water supply system 1 of the present embodiment includes a third temperature sensor 18 for detecting the temperature of the heat source air before feeding to the heat absorption heat exchanger 14, and the control means 100 detects the third temperature sensor 18. The higher the temperature, the higher the target hot water temperature is set, while the lower the detection temperature of the third temperature sensor 18, the lower the target hot water temperature is set.
As described above, the lower the outside air temperature, the lower the hot water discharge temperature of the first heat radiating heat exchanger 12A for operation, so that the COP of the heat pump circuit 10 is improved. Further, as the outside air temperature is lower, the circulating flow rate of the first heat exchanger 12A is increased, so that the hot water storage temperature rises in a short time. Even when the hot water outlet temperature of the first heat radiating heat exchanger 12A is low, the insufficient amount of heat is supplemented by the steam S1. As a result, high-temperature hot water can be continuously produced while improving the COP of the entire system.

<Second Embodiment>
Next, the second embodiment will be described with reference to the drawings. FIG. 3 is a diagram schematically showing the configuration of the hot water supply system 1 in the present embodiment. In the present embodiment, the same components as those in the first embodiment may be designated by the same reference numerals and the description thereof may be omitted.

As shown in FIG. 3, the hot water supply system 1 of the present embodiment does not include the steam heating means 50A. Instead, it is equipped with steam heating means 50B. The steam heating means 50B heats the make-up water W2 flowing through the make-up water line L2 with the steam S1.

The steam heating means 50B includes a steam heat exchanger 40B, a first temperature sensor 42B as a first temperature detecting means, a steaming line L21, and a steaming valve 43.

The steam heat exchanger 40B is provided in the make-up water line L2 from the second heat dissipation heat exchanger 12B to the hot water storage tank 60. The steam heat exchanger 40B is an indirect heat exchanger having the same configuration as the steam heat exchanger 40A of the first embodiment, and heat exchanges the make-up water W2 and the steam S1 via a heat transfer body.
The make-up water W2 heated to a relatively medium temperature (for example, 50 to 70 ° C.) in the second heat exchanger 12B is heated by the steam S1 in the steam heat exchanger 40B and has a relatively high temperature (for example, 75). The temperature is raised to ~ 95 ° C.).
The make-up water W2 heated by the steam heat exchanger 40B is supplied to the hot water storage tank 60 through the make-up water line L2.

The first temperature sensor 42B (first temperature detecting means 42B) is provided in the make-up water line L2. The first temperature sensor 42B detects the temperature of the make-up water W2 flowing out of the steam heat exchanger 40B.

The upstream side of the steaming line L21 is connected to a steam header (not shown), and the downstream side thereof is connected to the steam heat exchanger 40B, as in the first embodiment. The steaming line L21 feeds the steam S1 from the steam header to the steam heat exchanger 40B. The steaming line L21 is provided with a steaming valve 43 similar to that of the first embodiment.

The control content of the steam supply valve control unit 150 configured as a part of the steam heating means 50B is the same as the control content described in the first embodiment. However, as the detection temperature used for control, the detection temperature of the first temperature sensor 42B is used. That is, the steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42B becomes the target heating temperature (for example, 90 ° C.).

As described above, the hot water storage tank 60 is provided with the steam heat exchanger 40B in the make-up water line L2 and the steam flow rate is adjusted so that the hot water outlet temperature of the steam heat exchanger 40B becomes the target heating temperature (for example, 90 ° C.). Is replenished with hot water at the target heating temperature. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

With the above configuration, in the heat pump circuit 10, hot water having a relatively medium temperature (for example, 50 to 70 ° C.) is generated in the second heat exchanger for heat dissipation. The medium temperature hot water is heated by the steam S1 while flowing through the make-up water line L2 to become hot water having a relatively high temperature (for example, 75 to 95 ° C.). As a result, while operating the heat pump circuit 10 under the condition of medium-temperature hot water that can be expected to have a high COP, it is possible to quickly produce high-temperature hot water required at hot water demand points and hot water demand points. Further, since the steam S1 has a high calorific value, even if the temperature of the heat source air fluctuates seasonally and the temperature of the hot water generated by the heat pump circuit 10 is not stable, the steam S1 is immediately heated to the required hot water supply temperature. can do.

Subsequently, a modified example of the second embodiment will be described with reference to the drawings. FIG. 4 is a diagram schematically showing a configuration of a hot water supply system according to a modified example of the second embodiment. In this modification, the configuration of the steam heating means is different from that of the above embodiment. This modification includes the steam heating means 51B instead of the steam heating means 50B. The steam heating means 51B is provided with a steam mixer 41B instead of the steam heat exchanger 40B as compared with the steam heating means 50B.

The steam mixer 41B is provided in the make-up water line L2 from the second heat dissipation heat exchanger 12B to the hot water storage tank 60. The steam mixer 41B mixes the steam S1 supplied from the steaming line L21 with the make-up water W2 flowing through the make-up water line L2. As a result, heat exchange is directly performed between the make-up water W2 and the steam S1, and as a result, the temperature of the make-up water W2 flowing through the make-up water line L2 rises. At this time, the total heat of the steam S1, that is, the sensible heat and the latent heat, is utilized to rapidly raise the temperature of the make-up water W2 flowing through the make-up water line L2. In this modification, a static mixer is used as the steam mixer. The static mixer is a static mixer without a drive unit, and has a configuration in which steam S1 is mixed with circulating water W1 by a spiral element arranged in a pipe.

The other components constituting the steam heating means 51B, that is, the first temperature sensor 42B, the steaming line L21, and the steaming valve 43 are the same as the components of the steam heating means 50B described with reference to FIG. Further, the control content of the steam supply valve control unit 150 configured as a part of the steam heating means 51B is the same as the control content described above. The steam supply valve control unit 150 controls the steam supply valve 43 so that the detected temperature of the first temperature sensor 42B becomes the target heating temperature (for example, 90 ° C.).

In this modification as well, the steam drain line L22 and the air preheater 55 are not provided as in the modification of the first embodiment.

In this way, the hot water storage tank 60 is provided with the steam mixer 41B in the make-up water line L2 and by adjusting the steam flow rate so that the hot water outlet temperature of the steam mixer 41B becomes the target heating temperature (for example, 90 ° C.). Hot water at the target heating temperature is accumulated. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature. Further, since the steam condensed water generated after the latent heat is used is added to the make-up water W2, the hot water production capacity is also improved.

In the second embodiment and its modifications, a heat-sensitive cylinder may be used as the first temperature detecting means 42B instead of the temperature sensor. When the heat-sensitive cylinder is used as the first temperature detecting means 42B, the valve opening degree of the steam supply valve 43 is adjusted by the valve driving force generated by the heat-sensitive cylinder so that the detected temperature of the heat-sensitive cylinder becomes the target heating temperature. .. In this case, the control unit 100 does not have to have the steam supply valve control unit 150.

According to the hot water supply system 1 of the second embodiment described above, in addition to (1), (4) to (6), the following effects are obtained.

(7) The steam heating means 50B of the hot water supply system 1 of the present embodiment is provided in the make-up water line L2 from the second heat dissipation heat exchanger 12B to the hot water storage tank 60, and heat-transfers the make-up water W2 and the steam S1. From the steam heat exchanger 40B that exchanges heat via the steam heat exchanger 40B, the steam supply line L21 that feeds the steam S1 to the steam heat exchanger 40B, the steam supply valve 43 provided in the steam supply line L21, and the steam heat exchanger 40B. The steam supply valve 43 includes a first temperature detecting means 42B (first temperature sensor / heat sensitive cylinder) for detecting the temperature of the outflowing make-up water W2, and the steam supply valve 43 has a detection temperature of the first temperature detecting means 42B set to a target heating temperature. The valve opening degree is adjusted so as to be (by the control means 100 / by the valve driving force generated by the heat sensitive cylinder).
As described above, the hot water storage tank 60 is provided with the steam heat exchanger 40B in the make-up water line L2 and the steam flow rate is adjusted so that the hot water outlet temperature of the steam heat exchanger 40B becomes the target heating temperature (for example, 90 ° C.). Is replenished with hot water at the target heating temperature. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

(8) The steam heating means 51B of the hot water supply system 1 of the present embodiment is provided in the make-up water line L2 from the second heat dissipation heat exchanger 12B to the hot water storage tank 60, and is a steam mixture that mixes the make-up water W2 and the steam S1. Detects the temperature of the steam mixer 41B, the steam supply line L21 that feeds the steam S1 to the steam mixer 41B, the steam supply valve 43 provided in the steam supply line L21, and the make-up water W2 that flows out from the steam mixer 41B. A first temperature detecting means 42B (first temperature sensor / heat sensitive cylinder) is provided, and the steam supply valve 43 is provided so that the detected temperature of the first temperature detecting means 42B becomes the target heating temperature (by the control means 100 / heat sensitive). The valve opening is adjusted (by the valve driving force generated by the cylinder).
In this way, the hot water storage tank 60 is provided with the steam mixer 41B in the make-up water line L2 and by adjusting the steam flow rate so that the hot water outlet temperature of the steam mixer 41B becomes the target heating temperature (for example, 90 ° C.). Hot water at the target heating temperature is replenished. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.
Further, since the steam condensed water generated after the latent heat is used is added to the make-up water W2, the hot water production capacity is also improved.

<Third Embodiment>
Next, the third embodiment will be described with reference to the drawings. FIG. 5 is a diagram schematically showing the configuration of the hot water supply system 1 in the present embodiment. In the present embodiment, the same components as those in the first embodiment may be designated by the same reference numerals and the description thereof may be omitted.

As shown in FIG. 5, the hot water supply system 1 of the present embodiment does not include the steam heating means 50A. Instead, it is equipped with steam heating means 50C. The steam heating means 50C heats the hot water supply water W4 flowing through the hot water supply water line L4 with the steam S1.

The steam heating means 50C includes a steam heat exchanger 40C, a first temperature sensor 42C as a first temperature detecting means, a steaming line L21, and a steaming valve 43.

The steam heat exchanger 40C is provided in the hot water supply line L4. The steam heat exchanger 40C is an indirect heat exchanger having the same configuration as the steam heat exchanger 40A of the first embodiment, and heat exchange between the hot water supply water W4 and the steam S1 via a heat transfer body.
The hot water supply water W4 heated to a relatively medium temperature (for example, 50 to 70 ° C.) in the first heat exchanger 12A and / or the second heat exchanger 12B is subjected to steam S1 in the steam heat exchanger 40C. The temperature is raised to a relatively high temperature (for example, 75 to 95 ° C.).
The hot water supply water W4 heated by the steam heat exchanger 40C is sent to an external hot water demand point or hot water demand point through the hot water supply water line L4.

The first temperature sensor 42C (first temperature detecting means 42C) is provided in the hot water supply water line L4. The first temperature sensor 42C detects the temperature of the hot water supply water W4 flowing out of the steam heat exchanger 40C.

The upstream side of the steaming line L21 is connected to a steam header (not shown), and the downstream side thereof is connected to the steam heat exchanger 40C, as in the first embodiment. The steaming line L21 feeds the steam S1 from the steam header to the steam heat exchanger 40C. The steaming line L21 is provided with a steaming valve 43 similar to that of the first embodiment.

The control content of the steam supply valve control unit 150 configured as a part of the steam heating means 50C is the same as the control content described in the first embodiment. However, as the detection temperature used for control, the detection temperature of the first temperature sensor 42C is used. That is, the steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42C becomes the target heating temperature (for example, 90 ° C.).

In this way, the hot water supply water line L4 is provided with the steam heat exchanger 40C, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam heat exchanger 40C becomes the target heating temperature (for example, 90 ° C.). Alternatively, hot water with a target heating temperature is sent to the heat demand location. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

With the above configuration, in the heat pump circuit 10, hot water having a relatively medium temperature (for example, 50 to 70 ° C.) is generated in the first heat exchanger 12A and / or the second heat exchanger. The medium temperature hot water is heated by the steam S1 while flowing through the hot water supply line L4 to become hot water having a relatively high temperature (for example, 75 to 95 ° C.). As a result, while operating the heat pump circuit 10 under the condition of medium-temperature hot water that can be expected to have a high COP, it is possible to quickly produce high-temperature hot water required at hot water demand points and hot water demand points. Further, since the steam S1 has a high calorific value, even if the temperature of the heat source air fluctuates seasonally and the temperature of the hot water generated by the heat pump circuit 10 is not stable, the steam S1 is immediately heated to the required hot water supply temperature. can do.

Subsequently, a modified example of the third embodiment will be described with reference to the drawings. FIG. 6 is a diagram schematically showing a configuration of a hot water supply system according to a modified example of the third embodiment. In this modification, the configuration of the steam heating means is different from that of the above embodiment. This modification includes the steam heating means 51C instead of the steam heating means 50C. The steam heating means 51C is provided with the steam mixer 41C instead of the steam heat exchanger 40C as compared with the steam heating means 50C.

The steam mixer 41C is provided in the hot water supply line L4. The steam mixer 41C mixes the steam S1 supplied from the steam supply line L21 with the hot water supply water W4 flowing through the hot water supply water line L4. As a result, heat exchange is directly performed between the hot water supply water W4 and the steam S1, and as a result, the temperature of the hot water supply water W4 flowing through the hot water supply water line L4 rises. At this time, the total heat of the steam S1, that is, the sensible heat and the latent heat, is utilized to rapidly raise the temperature of the hot water supply water W4 flowing through the hot water supply water line L4. In this modification, a static mixer is used as the steam mixer. The static mixer is a static mixer without a drive unit, and has a configuration in which steam S1 is mixed with circulating water W1 by a spiral element arranged in a pipe.

The other components constituting the steam heating means 51C, that is, the first temperature sensor 42C, the steaming line L21, and the steaming valve 43 are the same as the components of the steam heating means 50C. Further, the control content of the steam supply valve control unit 150 configured as a part of the steam heating means 51C is the same as the control content described above. The steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42C becomes the target heating temperature (for example, 90 ° C.).

In this modification as well, the steam drain line L22 and the air preheater 55 are not provided as in the modification of the first embodiment.

In this way, the hot water supply water line L4 is provided with the steam mixer 41C, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam mixer 41C becomes the target heating temperature (for example, 90 ° C.). Hot water with the target heating temperature is sent to the demand point. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature. Further, since the steam condensed water generated after the latent heat is used is added to the hot water supply water W4, the hot water production capacity is also improved.

In the third embodiment and its modifications, a heat-sensitive cylinder may be used as the first temperature detecting means 42C instead of the temperature sensor. When the heat-sensitive cylinder is used as the first temperature detecting means 42C, the valve opening degree of the steam supply valve 43 is adjusted by the valve driving force generated by the heat-sensitive cylinder so that the detected temperature of the heat-sensitive cylinder becomes the target heating temperature. .. In this case, the control unit 100 does not have to have the steam supply valve control unit 150.

According to the hot water supply system 1 of the third embodiment described above, in addition to (1), (4) to (6), the following effects are obtained.

(9) The steam heating means 50C of the hot water supply system 1 of the present embodiment is provided in the hot water supply water line L4, and has a steam heat exchanger 40C for heat exchange between the hot water supply water W4 and the steam S1 via a heat transfer body, and steam heat. First temperature detection that detects the temperature of the steam supply line L21 that supplies steam S1 to the exchanger 40C, the steam supply valve 43 provided in the steam supply line L21, and the hot water supply water W4 that flows out from the steam heat exchanger 40C. The steam supply valve 43 includes means 42C (first temperature sensor / heat sensitive cylinder) so that the detected temperature of the first temperature detecting means 42C becomes the target heating temperature (by the control means 100 / the heat sensitive cylinder is generated). The valve opening is adjusted (by the valve driving force).
In this way, the hot water supply water line L4 is provided with the steam heat exchanger 40C, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam heat exchanger 40C becomes the target heating temperature (for example, 90 ° C.). Alternatively, hot water with a target heating temperature is sent to the heat demand location. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

(10) The steam heating means 51C of the hot water supply system 1 of the present embodiment is provided in the hot water supply water line L4, and supplies steam S1 to the steam mixer 41C that mixes the hot water supply water W4 and the steam S1 and the steam mixer 41C. First temperature detecting means 42C (first temperature sensor / heat sensitive cylinder) for detecting the temperature of the steam supply line L21, the steam supply valve 43 provided in the steam supply line L21, and the hot water supply water W4 flowing out of the steam mixer 41C. ), And the steam supply valve 43 adjusts the valve opening degree so that the detection temperature of the first temperature detecting means 42C becomes the target heating temperature (by the control means 100 / by the valve driving force generated by the heat sensitive cylinder). Will be done.
In this way, the hot water supply water line L4 is provided with the steam mixer 41C, and the steam flow rate is adjusted so that the hot water outlet temperature of the steam mixer 41C becomes the target heating temperature (for example, 90 ° C.). Hot water with the target heating temperature is sent to the demand point. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.
Further, since the steam condensed water generated after the latent heat is used is added to the hot water supply water W4, the hot water production capacity is also improved.

<Fourth Embodiment>
Next, the fourth embodiment will be described with reference to the drawings. FIG. 7 is a diagram schematically showing the configuration of the hot water supply system 1 in the present embodiment. In the present embodiment, the same components as those in the first embodiment may be designated by the same reference numerals and the description thereof may be omitted.

As shown in FIG. 7, the hot water supply system 1 of the present embodiment does not include the steam heating means 50A. Instead, it is equipped with steam heating means 50D. The steam heating means 50D heats the auxiliary circulating water W5 flowing through the auxiliary circulation line L5, which is a circulation line different from the water circulation line L1, with the steam S1.

The steam heating means 50D includes an auxiliary circulation line L5, an auxiliary circulation pump 45, a steam heat exchanger 40D, a first temperature sensor 42D as a first temperature detecting means, a steaming line L21, and a steaming valve 43. , Equipped with.

The upstream side of the auxiliary circulation line L5 is connected to the hot water storage tank 60, and the downstream side is also connected to the hot water storage tank 60. The auxiliary circulation line L5 circulates the stored water W3 in the hot water storage tank 60 as the auxiliary circulation water W5 by a route different from that of the water circulation line L1. An auxiliary circulation pump 45, a steam heat exchanger 40D, and a first temperature sensor 42D are sequentially arranged in the auxiliary circulation line L5 from the upstream side.

The rotation speed of the auxiliary circulation pump 45 can be controlled by an inverter. By changing the rotation speed of the auxiliary circulation pump 45, the circulation flow rate circulating in the auxiliary circulation line L5 can be adjusted.

The steam heat exchanger 40D is provided in the auxiliary circulation line L5. The steam heat exchanger 40D is an indirect heat exchanger having the same configuration as the steam heat exchanger 40A of the first embodiment, and heats stored water W3 and steam S1 circulating as auxiliary circulating water W5 via a heat transfer body. Have them exchanged.
The auxiliary circulating water W5 heated to a relatively medium temperature (for example, 50 to 70 ° C.) in the first heat exchanger 12A and / or the second heat exchanger 12B is the steam S1 in the steam heat exchanger 40D. The temperature is raised to a relatively high temperature (for example, 75 to 95 ° C.).
The auxiliary circulating water W5 heated by the steam heat exchanger 40D is supplied to the hot water storage tank 60 through the auxiliary circulation line L5.

The first temperature sensor 42D (first temperature detecting means 42D) is provided in the auxiliary circulation line L5. The first temperature sensor 42D detects the temperature of the auxiliary circulating water W5 flowing out of the steam heat exchanger 40D.

The upstream side of the steaming line L21 is connected to a steam header (not shown), and the downstream side thereof is connected to the steam heat exchanger 40D, as in the first embodiment. The steaming line L21 feeds the steam S1 from the steam header to the steam heat exchanger 40D. The steaming line L21 is provided with a steaming valve 43 similar to that of the first embodiment.

The control content of the steam supply valve control unit 150 configured as a part of the steam heating means 50D is the same as the control content described in the first embodiment. However, as the detection temperature used for control, the detection temperature of the first temperature sensor 42D is used. That is, the steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42D becomes the target heating temperature (for example, 90 ° C.).

In this way, the auxiliary circulation line L5, which is a route different from the water circulation line L1, is provided with the steam heat exchanger 40D, and steam is provided so that the hot water temperature of the steam heat exchanger 40D becomes the target heating temperature (for example, 90 ° C.). By adjusting the flow rate, hot water having a target heating temperature is accumulated in the hot water storage tank 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

With the above configuration, in the heat pump circuit 10, hot water having a relatively medium temperature (for example, 50 to 70 ° C.) is generated in the first heat exchanger 12A and / or the second heat exchanger. While the hot water having a medium temperature is stored in the hot water storage tank, the temperature is raised by the steam S1 through the flow of the auxiliary circulation line L5 to become hot water having a relatively high temperature (for example, 75 to 95 ° C.). As a result, while operating the heat pump circuit 10 under the condition of medium-temperature hot water that can be expected to have a high COP, it is possible to quickly produce high-temperature hot water required at hot water demand points and hot water demand points. Further, since the steam S1 has a high calorific value, even if the temperature of the heat source air fluctuates seasonally and the temperature of the hot water generated by the heat pump circuit 10 is not stable, the steam S1 is immediately heated to the required hot water supply temperature. can do.

Subsequently, a modified example of the fourth embodiment will be described with reference to the drawings. FIG. 8 is a diagram schematically showing a configuration of a hot water supply system according to a modified example of the fourth embodiment. In this modification, the configuration of the steam heating means is different from that of the above embodiment. This modification includes the steam heating means 51D instead of the steam heating means 50D. The steam heating means 51D is provided with the steam mixer 41D instead of the steam heat exchanger 40D as compared with the steam heating means 50D.

The steam mixer 41D is provided on the auxiliary circulation line L5. The steam mixer 41D mixes the steam S1 supplied from the steaming line L21 with the auxiliary circulating water W5 flowing through the auxiliary circulation line L5. As a result, heat exchange is directly performed between the auxiliary circulating water W5 and the steam S1, and as a result, the temperature of the auxiliary circulating water W5 flowing through the auxiliary circulation line L5 rises. At this time, the total heat of the steam S1, that is, sensible heat and latent heat, is utilized to rapidly raise the temperature of the auxiliary circulating water W5 flowing through the auxiliary circulation line L5. In this modification, a static mixer is used as the steam mixer. The static mixer is a static mixer without a drive unit, and has a configuration in which steam S1 is mixed with circulating water W1 by a spiral element arranged in a pipe.

For the other components constituting the steam heating means 51D, that is, the auxiliary circulation line L5, the auxiliary circulation pump 45, the first temperature sensor 42D, the steaming line L21, and the steaming valve 43, each component of the steam heating means 50D. Is similar to. Further, the control content of the steam supply valve control unit 150 configured as a part of the steam heating means 51D is the same as the control content described above. The steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42D becomes the target heating temperature (for example, 90 ° C.).

In this modification as well, the steam drain line L22 and the air preheater 55 are not provided as in the modification of the first embodiment.

In this way, the auxiliary circulation line L5, which is a route different from the water circulation line L1, is provided with the steam mixer 41D, and the steam flow rate is set so that the hot water temperature of the steam mixer 41D becomes the target heating temperature (for example, 90 ° C.). By adjusting, hot water having a target heating temperature is accumulated in the hot water storage tank 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.
Further, since the steam condensed water generated after the latent heat is used is added to the circulating stored water W3, the hot water production capacity is also improved.

In the fourth embodiment and its modifications, a heat-sensitive cylinder may be used as the first temperature detecting means 42D instead of the temperature sensor. When the heat-sensitive cylinder is used as the first temperature detecting means 42D, the valve opening degree of the steam supply valve 43 is adjusted by the valve driving force generated by the heat-sensitive cylinder so that the detected temperature of the heat-sensitive cylinder becomes the target heating temperature. .. In this case, the control unit 100 does not have to have the steam supply valve control unit 150.

According to the hot water supply system 1 of the fourth embodiment described above, in addition to (1) and (4) to (6), the following effects are obtained.

(11) The steam heating means 50D of the hot water supply system 1 of the present embodiment is provided in the auxiliary circulation line L5 and the auxiliary circulation line L5 for circulating the stored water W3 in the hot water storage tank 60 by a route different from the water circulation line L1. The steam S1 is supplied to the auxiliary circulation pump 45, the steam heat exchanger 40D provided in the auxiliary circulation line L5 for heat exchange between the circulating water W1 and the steam S1 via the heat transfer body, and the steam heat exchanger 40D. The first temperature detecting means 42D (first temperature sensor / heat sensitive cylinder) for detecting the temperature of the steaming line L21, the steaming valve 43 provided in the steaming line L21, and the circulating water W1 flowing out from the steam heat exchanger 40D. ), And the steam supply valve 43 adjusts the valve opening degree so that the detection temperature of the first temperature detecting means 42D becomes the target heating temperature (by the control means 100 / by the valve driving force generated by the heat sensitive cylinder). Will be done.
In this way, the auxiliary circulation line L5, which is a route different from the water circulation line L1, is provided with the steam heat exchanger 40D, and steam is provided so that the hot water temperature of the steam heat exchanger 40D becomes the target heating temperature (for example, 90 ° C.). By adjusting the flow rate, hot water having a target heating temperature is accumulated in the hot water storage tank 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

(12) The steam heating means 51D of the hot water supply system 1 of the present embodiment is provided in the auxiliary circulation line L5 and the auxiliary circulation line L5 for circulating the stored water W3 in the hot water storage tank 60 by a route different from the water circulation line L1. The auxiliary circulation pump 45, the steam mixer 41D provided in the auxiliary circulation line L5 to mix the circulating water W1 and the steam S1, the steam supply line L21 for supplying the steam S1 to the steam mixer 41D, and the steam supply line. The steam supply valve 43 is provided with a steam supply valve 43 provided in L21 and a first temperature detecting means 42D (first temperature sensor / heat sensitive cylinder) for detecting the temperature of the circulating water W1 flowing out from the steam mixer 41D. The valve opening degree is adjusted so that the detection temperature of the first temperature detecting means 42D becomes the target heating temperature (by the control means 100 / by the valve driving force generated by the heat sensitive cylinder).
In this way, the auxiliary circulation line L5, which is a route different from the water circulation line L1, is provided with the steam mixer 41D, and the steam flow rate is set so that the hot water temperature of the steam mixer 41D becomes the target heating temperature (for example, 90 ° C.). By adjusting, hot water having a target heating temperature is accumulated in the hot water storage tank 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.
Further, since the steam condensed water generated after the latent heat is used is added to the circulating stored water W3, the hot water production capacity is also improved.

<Fifth Embodiment>
Next, the fifth embodiment will be described with reference to the drawings. FIG. 9 is a diagram schematically showing the configuration of the hot water supply system 1 in the present embodiment. In the present embodiment, the same components as those in the first embodiment may be designated by the same reference numerals and the description thereof may be omitted.

As shown in FIG. 9, the hot water supply system 1 of the present embodiment does not include the steam heating means 50A. Instead, it is equipped with steam heating means 50E. The steam heating means 50E heats the stored water W3 in the hot water storage tank 60 with the steam S1.

The steam heating means 50E includes a steam heat exchanger 40E, a first temperature sensor 42E as a first temperature detecting means, a steaming line L21, and a steaming valve 43.

The steam heat exchanger 40E is provided in the hot water storage tank 60. The steam heat exchanger 40E is an indirect heat exchanger that exchanges heat between the stored water W3 and the steam S1 via a heat transfer body. As the steam heat exchanger 40E, for example, a double-tube steam heater can be used. In this steam heater, an inner pipe is inserted inside the outer pipe, a supply port for steam S1 is provided on one end side of the outer pipe, and a reception port for steam S1 is provided at the tip of the inner pipe. The steam S1 supplied into the outer pipe from the supply port heats the stored water W3 around the outer pipe through the pipe wall. The steam S1 that has completed heat exchange is led out of the outer pipe from the receiving port through the inside of the inner pipe. As a method of fixing the steam heater to the hot water storage tank 60, various fixing methods such as a hanging type, a flange type, and a diving type can be adopted. A stirrer may be provided in the hot water storage tank 60 in order to improve the temperature control efficiency and suppress temperature unevenness in the hot water storage tank 60.
The stored water W3 heated to a relatively medium temperature (for example, 50 to 70 ° C.) in the first heat exchanger 12A and / or the second heat exchanger 12B is stored in the steam heat exchanger 40E by the steam S1. The temperature is raised to a relatively high temperature (for example, 75 to 95 ° C.).
The stored water W3 heated by the steam heat exchanger 40E is stored in the hot water storage tank 60.

In the present embodiment, the hot water storage temperature sensor 61 provided in the hot water storage tank 60 serves as a first temperature sensor 42E (first temperature detecting means 42E). The first temperature sensor 42E detects the temperature of the stored water W3 in the hot water storage tank 60 that has been heated by the steam heat exchanger 40E.

The upstream side of the steaming line L21 is connected to a steam header (not shown), and the downstream side thereof is connected to the steam heat exchanger 40E, as in the first embodiment. The steaming line L21 feeds the steam S1 from the steam header to the steam heat exchanger 40E. The steaming line L21 is provided with a steaming valve 43 similar to that of the first embodiment.

The control content of the steam supply valve control unit 150 configured as a part of the steam heating means 50E is the same as the control content described in the first embodiment. However, as the detection temperature used for control, the detection temperature of the first temperature sensor 42E is used. That is, the steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42E becomes the target heating temperature (for example, 90 ° C.).

In this way, the steam heat exchanger 40E arranged in the hot water storage tank 60 is provided, and the hot water storage temperature is adjusted so that the hot water storage temperature in the hot water storage tank 60 reaches the target heating temperature (for example, 90 ° C.). Hot water having a target heating temperature is accumulated in the tank 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

With the above configuration, in the heat pump circuit 10, hot water having a relatively medium temperature (for example, 50 to 70 ° C.) is generated in the first heat exchanger 12A and / or the second heat exchanger. While the hot water having a medium temperature is stored in the hot water storage tank, the temperature is raised by the steam S1 to become hot water having a relatively high temperature (for example, 75 to 95 ° C.). As a result, while operating the heat pump circuit 10 under the condition of medium-temperature hot water that can be expected to have a high COP, it is possible to quickly produce high-temperature hot water required at hot water demand points and hot water demand points. Further, since the steam S1 has a high calorific value, even if the temperature of the heat source air fluctuates seasonally and the temperature of the hot water generated by the heat pump circuit 10 is not stable, the steam S1 is immediately heated to the required hot water supply temperature. can do.

Subsequently, a modified example of the fifth embodiment will be described with reference to the drawings. FIG. 10 is a diagram schematically showing a configuration of a hot water supply system according to a modified example of the fifth embodiment. In this modification, the configuration of the steam heating means is different from that of the above embodiment. This modification includes the steam heating means 51E instead of the steam heating means 50E. The steam heating means 51E is provided with the steam mixer 41E instead of the steam heat exchanger 40E as compared with the steam heating means 50E.

The steam mixer 41E is provided in the hot water storage tank 60. The steam mixer 41E mixes the steam S1 supplied from the steaming line L21 with the stored water W3 in the hot water storage tank 60. As a result, heat exchange is directly performed between the stored water W3 in the hot water storage tank 60 and the steam S1, and as a result, the temperature of the stored water W3 in the hot water storage tank 60 rises. At this time, the total heat of the steam S1, that is, the sensible heat and the latent heat, is utilized to rapidly raise the temperature of the stored water W3 in the hot water storage tank 60. In this modification, a steam injector is used as the steam mixer 41E. The steam injection section of the steam injector may be branched as shown in FIG. Further, a pipe-type steam injector having a plurality of steam injection holes on the outer peripheral surface may be used.

The other components constituting the steam heating means 51E, that is, the first temperature sensor 42E, the steaming line L21, and the steaming valve 43 are the same as the components of the steam heating means 50E. Further, the control content of the steam supply valve control unit 150 configured as a part of the steam heating means 51E is the same as the control content described above. The steam supply valve control unit 150 controls the steam supply valve 43 so that the detection temperature of the first temperature sensor 42E becomes the target heating temperature (for example, 90 ° C.).

In this modification as well, the steam drain line L22 and the air preheater 55 are not provided as in the modification of the first embodiment.

In this way, the hot water storage tank is provided with the steam mixer 41E arranged in the hot water storage tank 60, and the steam flow rate is adjusted so that the hot water storage temperature in the hot water storage tank 60 reaches the target heating temperature (for example, 90 ° C.). Hot water having a target heating temperature is accumulated in 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.
Further, since the steam condensed water generated after the latent heat is used is added to the stored water W3, the hot water production capacity is also improved.

In the fifth embodiment and its modifications, a heat-sensitive cylinder may be used as the first temperature detecting means 42E instead of the temperature sensor. Alternatively, as the first temperature detecting means 42E, a heat sensitive cylinder capable of detecting the temperature of the stored water W3 in the hot water storage tank 60 may be arranged separately from the hot water storage temperature sensor 61. When the heat-sensitive cylinder is used as the first temperature detecting means 42E, the valve opening degree of the steam supply valve 43 is adjusted by the valve driving force generated by the heat-sensitive cylinder so that the detected temperature of the heat-sensitive cylinder becomes the target heating temperature. .. In this case, the control unit 100 does not have to have the steam supply valve control unit 150.

According to the hot water supply system 1 of the fifth embodiment described above, in addition to (1), (4) to (6), the following effects are obtained.

(13) The steam heating means 50E of the hot water supply system 1 of the present embodiment is arranged in the hot water storage tank 60, and has a steam heat exchanger 40E that exchanges heat between the stored water W3 and the steam S1 via a heat transfer body, and steam heat. A first temperature detecting means 42E (1st temperature detecting means 42E) for detecting the temperature of the steam supply line L21 for supplying steam S1 to the exchanger 40E, the steam supply valve 43 provided in the steam supply line L21, and the stored water W3 in the hot water storage tank 60 ( A first temperature sensor / heat sensitive cylinder) is provided, and the steam supply valve 43 is provided with a valve driving force generated by the control means 100 / the heat sensitive cylinder so that the detected temperature of the first temperature detecting means 42E becomes the target heating temperature. The valve opening is adjusted.
In this way, the steam heat exchanger 40E arranged in the hot water storage tank 60 is provided, and the hot water storage temperature is adjusted so that the hot water storage temperature in the hot water storage tank 60 reaches the target heating temperature (for example, 90 ° C.). Hot water having a target heating temperature is accumulated in the tank 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.

(14) The steam heating means 51E of the hot water supply system 1 of the present embodiment is arranged in the hot water storage tank 60, and feeds the steam S1 to the steam mixer 41E that mixes the stored water W3 and the steam S1 and the steam mixer 41E. The steam supply line L21, the steam supply valve 43 provided in the steam supply line L21, and the first temperature detecting means 42E (first temperature sensor / heat sensitive cylinder) for detecting the temperature of the stored water W3 in the hot water storage tank 60. , And the valve opening degree of the steam supply valve 43 is adjusted so that the detection temperature of the first temperature detecting means 42E becomes the target heating temperature (by the control means 100 / by the valve driving force generated by the heat sensitive cylinder). ..
In this way, the hot water storage tank is provided with the steam mixer 41E arranged in the hot water storage tank 60, and the steam flow rate is adjusted so that the hot water storage temperature in the hot water storage tank 60 reaches the target heating temperature (for example, 90 ° C.). Hot water having a target heating temperature is accumulated in 60. As a result, it is possible to continuously generate hot water at a temperature level that is difficult to manufacture by the heat pump circuit 10 alone, and to stabilize the temperature.
Further, since the steam condensed water generated after the latent heat is used is added to the stored water W3, the hot water production capacity is also improved.

Although the preferred embodiments of the hot water supply system of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be appropriately modified. It is also possible to combine a plurality of embodiments.

1 Hot water supply system 10 Heat pump circuit 11 Compressor 12A First heat dissipation heat exchanger (condensor)
12B 2nd heat exchanger (supercooler)
13 Expansion valve 14 Endothermic heat exchanger (evaporator)
18 Third temperature sensor (heat source temperature sensor)
21 Water circulation pump 22 Second temperature sensor (condenser hot water temperature sensor)
25 Make-up water valve 40A, 40B, 40C, 40D, 40E Steam heat exchanger 41A, 41B, 41C, 41D, 41E Steam mixer 42A, 42B, 42C, 42D, 42E First temperature sensor (first temperature detecting means)
43 Steam supply valve 45 Auxiliary circulation pump 50A, 50B, 50C, 50D, 50E Steam heating means 51A, 51B, 51C, 51D, 51E Steam heating means 55 Air preheater 60 Hot water storage tank 61 Hot water storage temperature sensor 62 Water level sensor 100 Control unit ( Control means)
110 Water circulation pump control unit 115 Target hot water temperature setting unit 120 Supplementary water valve control unit 150 Steam supply valve control unit L1 Water circulation line L2 Supplementary water line L4 Hot water supply water line L5 Auxiliary circulation line L9 Refrigerator circulation line L21 Steam supply line L22 Steam drain line W1 Circulating water W2 Supplementary water W3 Reservoir water W4 Hot water supply water W5 Auxiliary circulating water R Refrigerator (gas refrigerant, liquid refrigerant)
S1 steam S2 steam drain

Claims (14)

The compressor, the first heat exchanger for heat dissipation, the second heat exchanger for heat dissipation, the expansion valve and the heat exchanger for heat absorption are connected in an annular shape by the refrigerant circulation line, and the heat exchanger for heat absorption is driven by the compressor. A steam compression type heat pump circuit that absorbs heat from the heat source air and dissipates heat with the first heat exchanger and / or the second heat exchanger.
A hot water storage tank that stores make-up water and
A water circulation line that circulates the stored water in the hot water storage tank to the first heat exchanger for heat dissipation.
A make-up water line that sends make-up water to the hot water storage tank while circulating make-up water to the second heat exchanger.
A hot water supply line that sends the stored water in the hot water storage tank to the outside,
One or more of the circulating water flowing through the water circulation line, the make-up water flowing through the make-up water line, the hot water supply water flowing through the hot water supply water line, and the stored water in the hot water storage tank is heated by steam. A hot water supply system equipped with steam heating means. The steam heating means is
A steam heat exchanger provided in the water circulation line from the first heat radiating heat exchanger to the hot water storage tank and exchanging heat between the circulating water and steam via a heat transfer body.
A steaming line that feeds steam to the steam heat exchanger,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the circulating water flowing out of the steam heat exchanger is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
A steam mixer provided in the water circulation line from the first heat dissipation heat exchanger to the hot water storage tank to mix steam with the circulating water, and
A steaming line that feeds steam to the steam mixer,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the circulating water flowing out of the steam mixer is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
A steam heat exchanger provided in the make-up water line from the second heat radiating heat exchanger to the hot water storage tank and exchanging heat between make-up water and steam via a heat transfer body.
A steaming line that feeds steam to the steam heat exchanger,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the make-up water flowing out of the steam heat exchanger is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
A steam mixer provided in the make-up water line from the second heat radiating heat exchanger to the hot water storage tank to mix make-up water and steam, and
A steaming line that feeds steam to the steam mixer,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the make-up water flowing out of the steam mixer is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
A steam heat exchanger provided in the hot water supply line to exchange heat between hot water supply water and steam via a heat transfer body.
A steaming line that feeds steam to the steam heat exchanger,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the hot water supplied from the steam heat exchanger is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
A steam mixer provided in the hot water supply line to mix hot water and steam, and
A steaming line that feeds steam to the steam mixer,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the hot water supplied from the steam mixer is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
An auxiliary circulation line that circulates the stored water in the hot water storage tank by a route different from the water circulation line,
The auxiliary circulation pump provided in the auxiliary circulation line and
A steam heat exchanger provided in the auxiliary circulation line that exchanges heat between circulating water and steam via a heat transfer element.
A steaming line that feeds steam to the steam heat exchanger,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the circulating water flowing out of the steam heat exchanger is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
An auxiliary circulation line that circulates the stored water in the hot water storage tank by a route different from the water circulation line,
The auxiliary circulation pump provided in the auxiliary circulation line and
A steam mixer provided in the auxiliary circulation line to mix circulating water and steam,
A steaming line that feeds steam to the steam mixer,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the circulating water flowing out of the steam mixer is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
A steam heat exchanger that is arranged in the hot water storage tank and exchanges heat between stored water and steam via a heat transfer body.
A steaming line that feeds steam to the steam heat exchanger,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the stored water in the hot water storage tank is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The steam heating means is
A steam mixer arranged in the hot water storage tank to mix stored water and steam, and
A steaming line that feeds steam to the steam mixer,
The steam supply valve provided in the steam supply line and
A first temperature detecting means for detecting the temperature of the stored water in the hot water storage tank is provided.
The hot water supply system according to claim 1, wherein the steam supply valve is adjusted in valve opening degree so that the detection temperature of the first temperature detecting means becomes a target heating temperature. The endothermic heat exchanger is provided with an air preheater that preheats the heat source air before feeding.
The hot water supply system according to any one of claims 2, 4, 6, 8 and 10, wherein the air preheater preheats heat source air by using a steam drain discharged from the steam heat exchanger. A second temperature sensor that detects the temperature of the circulating water flowing out of the first heat exchanger for heat dissipation, and
The water circulation pump provided in the water circulation line and
With control means,
The hot water supply system according to any one of claims 2 to 12, wherein the control means controls the drive frequency of the water circulation pump so that the detection temperature of the second temperature sensor becomes the target hot water discharge temperature. The endothermic heat exchanger is equipped with a third temperature sensor that detects the temperature of the heat source air before feeding.
The control means sets the target hot water temperature higher as the detection temperature of the third temperature sensor is higher, while the control means sets the target hot water temperature lower as the detection temperature of the third temperature sensor is lower. The hot water supply system described.

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